<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<%@ page language="java" contentType="text/html; charset=utf-8"%>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>???????</title>
</head>
<body>
  <%
  pageContext.setAttribute("msg", "data in page");
  request.setAttribute("msg", "data in request");
  session.setAttribute("msg", "data in session");
  application.setAttribute("msg", "data in application");
  %>
  
  <%
    out.print(pageContext.getAttribute("msg"));
    request.getRequestDispatcher("b.jsp").forward(request, response);
  %>
</body>
</html>